Tieths to leopold katzenstein



UNITED STATES PATENT OFFICE.

SALOMON HEIMANN, OF NEWV YORK, N. Y., ASSIGNOR OF ELEVEN-'IWVEN- TIETHSTO LEOPOLD KATZENSTEIN, OF SAME PLACE.

INSULATING COMPOUND.

SPECIFICATION forming part of Letters Patent No. 547,120, dated October1, 1895.

Application filed February 28, 1895. Serial No. 5 01 7- (N0 p ci n Towhom it may concern.-

Be it known that I, SALOMON HEIMANN, a citizen of Germany, and aresident of the city of New York, in the county of New York and State ofNew York, have invented certain new and useful Improvements inInsulating Oompounds, of which the following is a specification.

This invention relates to improvements in compounds to be used forinsulating electric conductors of all kinds.

The object of my invention is to provide a new and improved insulatingcompound which is absolutely waterproof, offers great resistance tofire, is so flexible that it does not break even when the wire or othercondoctor is bent short or twisted, adheres firmly to the article uponwhich it has been applied, produces a perfect insulating-covering ofslight thickness,iis lasting and durable, and is not expensive.

My improved compound is composed of the following ingredients, mixed andcompounded in a manner that will now be set forth: pulverized asbestos,pulverized glass, rubber, rosin-oil, mirbaneoil, celluloid orpyroxyline, castor-oil, benzine. About equal quantities of finely andminutely pulverized asbestos and of pulverized glass are thoroughlymixed, and to the same from ten to fifteen per cent. in weight of rubberis added, preferably in scraps, and thoroughly mixed, and this mixtureis then rolled between heated rollers to form flexible sheets or plates,which are then dissolved in benzine to about the consistency of sirup.To this are added about five per cent. of caster-oil and about twentyper cent. each of rosin-oil and mirbane-oil. This mixture is thoroughlystirred, and then from ten to fifteen per cent. of celluloid dissolvedin amyloxide acetic is added, and the entire mixture is again thoroughlystirred and is then ready for use. To render wire proof againstoverheating by too much electrical tension in the wire, the wire isfirst provided with a coating composed of a mixture of water-glass andpulverized glass. The compound is applied on wire by drawing the wirethrough the compound and removing the surplus, or by dipping, and isthen dried in the open air or in heated chambers. On other parts to beinsulated it is applied by means of a brush and on sheets of paper orother substances to be used as insulating-layers by dipping them andthen drying them.

The coating of water-glass and pulverized glass first applied is afireproof coating, which, in case the electrical tension is too great,prevents the outer coating from catching fire from overheating the wire.The outer coating composed of the compound is absolutely waterproof anda perfect non-conductor of electricity, and at the same time can resistheat sufficiently to prevent its being melted off.

While the coating formed of the compound is not absolutely fireproof, itcan resist heat to such an extent that it does not burn or melt, butonly becomes charred; but even then retains its insulating propertiesand does not break or chip off the wire.

The covering or coating produced by my compound increases the diameterof the wire but very slightly, and does not in any wise interfere withthe flexibility of the wire. The pulverized glass and asbestos in thecompound renders the coating formed of the same heatresisting, thecastor-oil gives the compound the necessary fluidity, the rosin-oil andrubher the required viscosity, and the mirbaneoil the necessaryflexibility, and the 1nirbaneoil does not dry even when the castor-oiland the rosin-oil have hardened to a certain extent. The mirbane-oilalso prevents the rubber and castor-oil and rosin-oil from hardening tosuch an extent as they would harden if not mixed with the mirbane-oil.The rubber and celluloid form a binding and holding body, and when mixedwith the above-named oils and other ingredients form the insulating andwaterproof part of the coating.

On account of the above properties the com pound can be used in place ofvarnish or paraffine for insulating parts of electrical appliances, andpaper sheets saturated with the compound form perfect insulating-layersfor electric coils, 850.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

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oil, castor oil and dissolved celluloid, substam tially as hereindescribed and set forth.

In testimony that I claim the foregoing as my invention I have signed myname, in pres- I5 ence of two witnesses, this 27th day of February,1895.

SALOMON IIEIMANN.

Witnesses:

OSCAR F. GUNz, N. M. FLANNERY,

